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Still not rich at WOT

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by bigburban383, Apr 2, 2004.

  1. bigburban383

    bigburban383 1/2 ton status

    Dec 30, 2003
    Likes Received:
    Michigan, Royal Oak
    I have a 388 small block and I was using the stock TBI unit and the stock injectors for a 5.7. It ran lean at low speed cruise, and was still kinda lean at high speeds. WOT thottle it would be at stochiometric, but I know at WOT its supposed to be a little rich. Now with upgrading to 454 injectors, cruising has perfect a/f ratio. At WOT it still will not go rich, only stays in stoch. I am using a A/F guage off the O2 sensor to get the info.

    Will having the O2 farther away from the engine skew the readings? My O2 is in the collector. It does go into closed loop.
  2. 4xcrazy

    4xcrazy 3/4 ton status

    Oct 31, 2003
    Likes Received:
    Olympia/Lacey, Washington
    Sounds like the computer needs recalibrated for the bigger cubes in the block, /forums/images/graemlins/dunno.gif

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